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Both men were arrested on September 25 last year on suspicion of being members of the organisation.

They have remained on police bail throughout the investigation.

Sue Hemming, head of special crime and counter terrorism at the Crown Prosecution Service, said: "Following an investigation by the Metropolitan Police's counter terrorism command, we have today authorised charges against Anjem Choudary and Mohammed Mizanur Rahman.

"We have concluded that there is sufficient evidence and it is in the public interest to prosecute Anjem Choudary and Mohammed Rahman for inviting support for ISIL, a proscribed terrorist organisation, between 29 June 2014 and 6 March this year. Each man is charged with one offence contrary to section 12 of the Terrorism Act 2000.

"It is alleged that Anjem Choudary and Mohammed Rahman invited support for Isis in individual lectures which were subsequently published online."